CN107534534A - The transmission method and device of physical layer protocol data unit - Google Patents

The transmission method and device of physical layer protocol data unit Download PDF

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Publication number
CN107534534A
CN107534534A CN201580079146.2A CN201580079146A CN107534534A CN 107534534 A CN107534534 A CN 107534534A CN 201580079146 A CN201580079146 A CN 201580079146A CN 107534534 A CN107534534 A CN 107534534A
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ppdu
value
instruction information
formula
field
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CN107534534B (en
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林梅露
刘云
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/323—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the physical layer [OSI layer 1]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

The embodiments of the invention provide a kind of physical layer protocol data unit PPDU transmission method, including：Generation and transmission PPDU, the PPDU includes signal extension SE fields, the SE fields are after last orthogonal frequency division multiplex OFDM symbol with information is carried, and the PPDU includes configured information, and the configured information is located at efficient signaling field HE SIG；Wherein, symbol lengths generations of the configured information I based on SE fields, for indicating whether receiving terminal should the obtained number of OFDM symbol of Adjustable calculation.

Description

The transmission method and device of physical layer protocol data unit Technical field
The invention belongs to field of communication technology more particularly to the transmission methods and device of physical layer protocol data unit.
Background technique
In WLAN (English: Wireless Local Area Network, Chinese: WLAN) in, for the efficiency of improve data transfer, 4x symbol lengths are introduced in next generation wlan standard 802.11ax, the symbol of corresponding 802.11a/n/ac is referred to as 1x symbol.
So-called 4x symbol lengths refer in an OFDM (English: Orthogonal Frequency Division Multiplexing, referred to as: orthogonal frequency division multiplexing) in symbol, data length 12.8us.The ratio that the CP of corresponding 3.2us is shared in an OFDM symbol has reformed into (3.2/ (3.2+12.8))=20%, effectively increases efficiency of transmission.It can be seen that the time-domain transmission time of data portion becomes 12.8us from 3.2us, 4 times are expanded, corresponding to reduce 4 times in the bandwidth that frequency domain then shows as each subcarrier, because bandwidth is smaller, transmission time is longer.Specifically, for 802.11ac, there are 64 subcarriers, corresponding 64 point FFT on 20MHz；There are 128 subcarriers on 40MHz, for 128 point FFT；There are 256 subcarriers, corresponding 256 point FFT on 80MHz.There are 256 subcarriers, corresponding 256 point FFT for 802.11ax, on 20MHz；There are 512 subcarriers on 40MHz, for 512 point FFT；There are 1024 subcarriers, corresponding 1024 point FFT on 80MHz.
It include 52 data subcarriers, 4 pilot sub-carriers in 64 subcarriers of 802.11ac using 20MHz as example；It include 234 data subcarriers, 8 pilot sub-carriers in 256 subcarriers of 802.11ax.According to identical MCS (English: Modulation and Coding Scheme, Chinese: modulation and coding strategy), compared to 802.11ac, 802.11ax can transmit the data volume greater than 4 times, this is because (234 > 4*52)., there is consistent result in the case where for 40MHz and 80MHz.
After introducing 4x data symbol length, for receiving end, the time of each OFDM symbol is handled with regard to elongated.The processing time of receiving end mainly includes: 1.FFT (English: Fast Fourier Transform, Chinese: Fast Fourier Transform (FFT))；2. demapping；3. channel decoding.Most time-consuming is channel decoding part among these, and since the data volume in each OFDM symbol becomes larger, the time of channel decoding is with regard to elongated.This processing delay at big bandwidth (80MHz etc.), high MCS (such as: MCS9 etc.) can become very serious under situation.
When receiving some data frames or control frame that needs to reply at once and (reply after SIFS=16us), receiving end needs first to complete the processing of the data frame or control frame, after reception state is switched to transmission state.This two-part time-consuming needs to complete in the time in SIFS (English: Short Interframe Space, Chinese: short frame interval).For 1x symbol lengths (i.e. the frame of 802.11a/n/ac), the SIFS duration of 16us allows receiving end to complete data processing and state switching enough.But for 4x symbol (i.e. the frame of 802.11ax), the processing of data may generate bigger time delay, thus in the SIFS duration of current 16us, receiving end cannot complete the switching of data processing state.
Summary of the invention
The present invention provides a kind of transmission method of physical layer protocol data unit and devices, generate bigger time delay to solve receiving end data processing, so that in the SIFS duration of current 16us, the problem of receiving end cannot complete the switching of data processing state.
First aspect, the embodiment of the invention provides the transmission methods of physical layer protocol data unit PPDU a kind of, applied to WLAN, including generating physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, for the SE field after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated；
Send the PPDU.
On the other hand, a kind of transmission method of physical layer protocol data unit is provided accordingly, receive physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, the SE field is after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the finger Show that information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated；
The PPDU is parsed, the OFDM symbol number M1 of the PPDU transmission is obtained.
Its working principle and other more excellent features can refer to each method in embodiment, and details are not described herein again.
The embodiment of the present invention can indicate the length of SE using less bit in the transmission process of physical layer protocol data unit PPDU.Using the embodiment of the present invention, it can ensure that data processing and the switching of state is rapidly completed in receiving end by SE, moreover it is possible to further less relevant information overhead.
Detailed description of the invention
Fig. 1 is the application scenario diagram of the embodiment of the present invention.
Fig. 2 is the structure chart of the physical layer protocol data unit of the embodiment of the present invention.
Fig. 3 is the part-structure figure of possible embodiment PPDU.
Fig. 4 is the part-structure figure of possible embodiment PPDU.
Fig. 5 is the part-structure figure of possible embodiment PPDU.
Fig. 6 is the rough schematic of L-LENGTH round error in preferably embodiment PPDU.
Fig. 7 is the rough schematic of the L-LENGTH round error of preferably embodiment PPDU.
Fig. 8 is the rough schematic of an access point.
Fig. 9 is the rough schematic of a website.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the specific embodiment of the invention is described in further detail with reference to the accompanying drawing.In order to fully understand the present invention, numerous details are referred in the following detailed description.It will be appreciated by those skilled in the art that the present invention may not need the realization of these details.In other instances, it is not described in detail well known method, process, component and circuit etc., in order to avoid embodiment is caused unnecessarily to obscure.Obviously, embodiments described below is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts Example, shall fall within the protection scope of the present invention.
The embodiment of the present invention can be applied to WLAN, and WLAN accepted standard is Institute of Electrical and Electric Engineers (Institute of Electrical and Electronics Engineers, abbreviation IEEE) 802.11 series at present.WLAN may include multiple basic service sets (Basic Service Set, abbreviation BSS), the node of basic service set is site STA, website includes website (the Access Point of access point class, abbreviation AP) and non-access point class website (None Access Point Station, abbreviation Non-AP STA), each basic service set may include an AP and multiple Non-AP STA for being associated with the AP.
Access point class website, also referred to as wireless access points or hot spot etc..AP is the access point that mobile subscriber enters cable network, and major deployments are inside family, inside buildings and garden, and typical covering radius is tens meters to rice up to a hundred, it is of course also possible to be deployed in open air.AP is equivalent to the bridge of connection a wired network and wireless network, and main function is to connect together each wireless network clients, and wireless network is then accessed wired network.Specifically, AP can be terminal device or the network equipment with Wireless Fidelity (Wireless Fidelity, abbreviation WiFi) chip.Optionally, AP can be the equipment of support 802.11ax standard, and still optionally further, which can be the equipment of a variety of WLAN standards such as support 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
Above-mentioned Non-AP STA can be wireless communications chips, wireless sensor or wireless communication terminal.Such as: the mobile phone for supporting WiFi communication function, the tablet computer for supporting WiFi communication function, the set-top box for supporting WiFi communication function, the smart television for supporting WiFi communication function, the intelligent wearable device for supporting WiFi communication function, the vehicular communication equipment for supporting WiFi communication function and the computer for supporting WiFi communication function.Optionally, website can support 802.11ax standard, and still optionally further, which supports a variety of WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.
It should be noted that AP can carry out downstream transmission to different STA on different running time-frequency resources in the wlan system 802.11ax being introduced into after OFDMA technology.AP, which carries out downstream transmission, can use different modes, such as OFDMA single user multiple-input and multiple-output (Single-User Multiple-Input Multiple-Output, abbreviation SU-MIMO) mode or OFDMA multi-user's multiple-input and multiple-output (Multi-User Multiple-Input Multiple-Output, abbreviation MU-MIMO).
Fig. 1 is the application scenario diagram of the embodiment of the present invention.Wherein communicated between access point 20 and multiple websites (30-1,30-2,30-3,30-4).AP 20 includes the host-processor 15 for being coupled to network interface 16.Network interface 16 includes medium access control (MAC) unit 17 and physical layer (PHY) unit 18.Physical layer (PHY) unit 18 includes multiple transceivers 19, and transceiver 19 is coupled to more antennas pair.Although three transceivers 19 and three antennas 14 are shown in FIG. 1, AP 14 may include the transceiver 19 and antenna pair of different numbers (for example, 1,2,4,5 etc.) in other embodiments.
Website 30-1 includes the host-processor 25 for being coupled to network interface 26.Network interface 26 includes MAC unit 27 and PHY unit 28.PHY unit 28 includes multiple transceivers 29, and transceiver 29 is coupled to more antennas.Although illustrating three transceivers 29 and three antennas 24 in Fig. 1, client site 30-1 may include the transceiver and antenna of different numbers (for example, 1,2,4,5 etc.) in other embodiments.In the present embodiment, one or more of website 30-2,30-3 and 30-4 have with the same or similar structure of client site 30-1, but may have the transceiver and antenna of identical or different number.For example, only one transceiver of conventional station 30-4 and an antenna.
Fig. 2 is physical layer protocol data unit (Physical Layer Protocol Data Unit, abbreviation PPDU) structure chart according to the present embodiment.The data cell occupies 80MHz bandwidth.In other embodiments, data cell 100 can occupy different bandwidth, such as 20MHz, 40MHz, 120MHz, 160MHz or any appropriate bandwidth.Data cell 100 is suitble to " mixed mode " occasion, such as when WLAN 10 includes website (for example, conventional station 30-4), meets legacy protocol and do not meet 802.11ax agreement.Data cell 100 can also be used in other occasions.
It should be noted that the data cell of Fig. 2 is a kind of possible 802.11ax data cell, to be compatible with existing WLAN standard equipment holdings, the head of the 802.11ax data frame is Legacy Preamble (Chinese: legacy preamble) field, including L-STF (English: Legacy Short Training Field, Chinese: Legacy Short Training Field), L-LTF (English: Legacy Long Training Field, Chinese: the long short training field of tradition) and L-SIG (English: Legacy Signaling Field, Chinese: legacy signaling field).Legacy Preamble field is followed by RL-SIG (English: Repeated Legacy Signaling Field, Chinese: legacy signaling field is repeated), efficient signaling field A (English: High Efficiency Signal Field A, referred to as: HE-SIGA) and other efficient preamble field Other HE Preamble.It should be noted that Other HE Preamble refers to the combination of a field or multiple fields, it is not limited to refer in particular to a specific field, is data field (Data) after Other Hew Preamble field.In the following possible WLAN standard; title or the title of field of its standard etc. can be replaced using other any titles; it should not be believed to be construed as limiting protection scope of the present invention, and subsequent embodiment is equally applicable to for the explanation of the data frame.
Different from 802.11n and 802.11ac, 802.11ax considers the scene of outdoor transmissions.In outdoor, since the influence of multipath is more serious, channel delay spread is big, and CP (Cyclic Prefix) will select longer length to guarantee the quality of transmission thus.
By taking the part Data in Fig. 1 packet configuration as an example, the part Data contains multiple OFDM symbols.In 802.11ac, the length of an OFDM symbol is 4/3.6 μ s, and it is 0.8/0.4 μ s that wherein data length, which is 3.2 μ s, CP length,.For 802.11ax, in order to meet outdoor transmission performance, the length of CP needs to get 1.6/3.2 μ s.If data portion still keeps 3.2 μ s, in an OFDM symbol, the ratio that CP is accounted for is up to 33% (1.6 μ s cp+3.2 μ s data) or 50% (3.2 μ s cp+3.2 μ s data).Therefore, in order to improve the efficiency of transmission, 4x symbol lengths are introduced in 802.11ax, the symbol of corresponding 802.11a/n/ac is referred to as 1x symbol.
So-called 4x symbol lengths refer to that in an OFDM symbol, data length is 12.8 μ s.The ratio that the CP of corresponding 3.2 μ s is shared in an OFDM symbol has reformed into (3.2/ (3.2+12.8))=20%, effectively increases efficiency of transmission.It can be seen that the time-domain transmission time of data portion becomes 12.8 μ s from 3.2 μ s, 4 times are expanded, the corresponding bandwidth contracting that each subcarrier is then shown as in frequency domain 4 times small, because bandwidth is smaller, transmission time is longer.Specifically, for 802.11ac, there are 64 subcarriers, corresponding 64 point FFT on 20M；There are 128 subcarriers, corresponding 128 point FFT on 40M；There are 256 subcarriers, corresponding 256 point FFT on 80M.There are 256 subcarriers, corresponding 256 point FFT for 802.11ax, on 20M；There are 512 subcarriers on 40M, for 512 point FFT；There are 1024 subcarriers, corresponding 1024 point FFT on 80M.
It include 52 data subcarriers, 4 pilot sub-carriers in 64 subcarriers of 802.11ac using 20M as example；It include 234 data subcarriers, 8 pilot sub-carriers in 256 subcarriers of 802.11ax.According to identical MCS, compared to 802.11ac, 802.11ax can transmit the data volume greater than 4 times, this is because (234 > 4*52)., there is consistent result in the case where for 40M and 80M.
As introduced in background technique, 802.11ac is compared, each OFDM symbol of the part Data of 802.11ax contains the data volume greater than 4 times.Therefore, for receiving end, the time of each OFDM symbol is handled with regard to elongated.The treatment process of receiving end mainly includes: 1.FFT；2. demapping；3. channel decoding.Most time-consuming is channel decoding part among these, and since the data volume in each OFDM symbol becomes larger, the time of channel decoding is with regard to elongated.This processing delay can become more serious when coding in big bandwidth (80M etc.), high MSC (MSC9 etc.), LDPC.
When receiving some data frames or control frame that needs to reply at once and (reply after SIFS=16 μ s), receiving end needs first to complete the processing of the data frame or control frame, after reception state is switched to transmission state.This two-part time-consuming needs to complete within the SIFS time.For 1x symbol lengths (i.e. the frame of 802.11a/n/ac), the SIFS duration of 16 μ s allows receiving end to complete data processing and state switching enough.But for 4x symbol (i.e. the frame of 802.11ax), the processing of data may generate bigger time delay, as described in the preceding paragraph.Thus, the SIFS duration of 16 μ s is in some cases, it can be possible to have little time the switching for allowing receiving end to complete data processing and state.
In conclusion implementation embodiment of the invention is focused on solving the problems, such as that the SIFS time not enough may complete data processing and state switching in receiving end.In order to which embodiment of the present invention understands, several possible embodiments will be first introduced, then introduce several preferably embodiments.
Possible embodiment one
As shown in figure 3, after the last one OFDM symbol of current transmission, adding one section of frame extension (FE, frame extension), it is therefore intended that provide the processing of some additional times for receiving data to receiving end in possible embodiment one.It can further be seen that some is filling bit in the last one OFDM symbol, English is padding.This part of padding is the padding of physical layer, that is, is not involved in coding and decoding.Therefore, receiving end can not decode this part, the time needed for saving processing data.The position that should stop decoding to allow receiving end to know, possible embodiment one also propose the payload length (payload length) that user is indicated in HE-SIGB.
The length of Frame extension is current transmission bandwidth, MCS, fluxion, the function of padding duration and receiving end processing capacity.Transmitting terminal is first according to the bandwidth of current transmission, MCS, the processing time needed for the reason capacity calculation at fluxion and receiving end goes out a receiving end, is denoted as x μ s.Then according to the data volume of user, the duration of the padding in the last one OFDM symbol is calculated, is denoted as y μ s.Finally, choosing length of the value not less than x-y as Frame extension from [0,4,8,12,16] μ s, the waveform of Frame extension is unlimited.The starting point of SIFS will be after Frame extension.
The case where for multi-user (MU-MIMO, OFDMA), transmitting terminal can calculate a frame extension to each user, choose longest frame extension and be placed on behind the last one OFDM symbol, and have the instruction of payload length to each user in HE-SIGB.
But the shortcomings that possible embodiment one, is:
Indicate that the payload length of user needs more bit, and the bit of HE-SIG is very precious, it is thus possible to embodiment one expense be it is bigger, especially when multi-user, this expense is just bigger, since it is desired that indicating each user their payload length.
Possible embodiment two
Possible embodiment two and possible embodiment one, it is inherently similar.Such as Fig. 4 It is shown, possible embodiment two equally proposes after the last one OFDM symbol, add one section of signal extension (SE, signal extension, the frame extension of i.e. possible embodiment one kind), it is therefore intended that the processing of some additional times for receiving data is provided to receiving end.It can be seen that also including some filling bit, i.e. padding, possible embodiment two referred to as post-FEC padding, essence is exactly the padding of physical layer, is not involved in coding and decoding in the last one OFDM symbol.Pre-FEC padding in possible embodiment two is different from post-FEC padding, and pre-FEC padding needs to participate in coding and decoding, and receiving end needs and treats a part of padding for going processing as information bit.
Since the effect of post-FEC padding is also that receiving end is allowed not go to handle, the time needed for saving processing data.Thus transmitting terminal is also required to the position for telling receiving end that should stop decoding.It is different from possible embodiment one, possible embodiment two does not allow receiving end to know the position that should stop decoding by instruction payload length, but the last one OFDM symbol is divided into several sections, indicate that Excess info bit and pre-FEC padding bit accounts for the ratio of the last one OFDM symbol in HE-SIG, as 00 expression accounts for 1/4,01 indicates that accounting for 1/2,10 indicates that accounting for 3/4,11 expressions accounts for 1.After receiving end reads the instruction, just stop decoding at corresponding segmentation.
Ratio shared by the length and Excess info bit and pre-FEC padding bit of Signal extension has the relationship mapped one by one, i.e., the position that should specifically stop decoding corresponding to specific Signal extension length.In this way, Signal extension length can also be obtained by aforementioned instruction.
The shortcomings that possible two scheme of embodiment, is:
The expense indicated in HE-SIG or relatively large, at least two bit；In addition, the length of signal extension is likely to result in overprotection not as different transmitting scenes (such as BW, MCS, fluxion) changes.It illustrates, if ratio shared by Excess info bit and pre-FEC padding bit is 3/4, it does not mean that and centainly needs to add signal extension yet, because current transmission is possible to using very low MCS, or seldom fluxion, traditional SIFS time completes data processing with regard to enough receiving ends and state has switched.
Possible embodiment three
As shown in Figure 5, with possible embodiment one and two, identical place is possible embodiment three, after the last one OFDM symbol (OFDM Symbol), add one section of Frame extension (signal extension, frame ext is denoted as in Fig. 5), it is therefore intended that the processing of some additional times for receiving data is provided to receiving end.Difference is, in possible embodiment three, the extension of this part signal is optional, if it is desired, can be set to 0.Meanwhile as shown in figure 5, possible embodiment three equally proposes in the last one OFDM symbol, also comprising some filling bit, i.e. padding, the padding of physical layer are denoted as PHY Padding, are not involved in coding and decoding.
Since the effect of PHY padding is also that receiving end is allowed not go to handle, the time needed for saving processing data.Thus transmitting terminal is also required to the position for telling receiving end that should stop decoding.Unlike possible embodiment one and two, possible embodiment three indicates the length of PHYPadding using two bits, for example there is no PHY padding as 00 expression accounts for, 01 expression PHY padding length accounts for the last one 1/4 length of OFDM symbol, 10 indicate that accounting for PHY padding length accounts for the last one 1/2 length of OFDM symbol, and 11 expression PHY padding length account for the last one 3/4 length of OFDM symbol.In addition to this, possible embodiment three indicates following several length { 0,4 μ s, 8 μ s, 12 μ s, 16 μ s } of Frame Extension (Signal Extension in i.e. possible embodiment two) using three bits.PHY padding and Frame Extension are indicated by five bit, and possible embodiment three can be supported flexibly to indicate the respective length of PHY padding and Frame Extension.
The shortcomings that possible embodiment three, is:
Indicate that the length of PHY padding and Frame Extension, expense are larger using 5 bits.
Possible embodiment four
Possible embodiment four place similar with possible embodiment two is, with two bit tables Show the position that should stop decoding at segmentation in the last one OFDM symbol.Meanwhile adding one section of signal extension (signal extension), it is therefore intended that provide the processing of some additional times for receiving data to receiving end.But difference is, in possible embodiment four, the extension of this part signal is optional, if it is desired, can be set to 0.It is used to refer to avoid this possible ambiguity so individually using a bit in transmitting terminal to be possible to meeting one symbol of more calculating when avoiding following situation, i.e. calculating 4x OFDM symbol number.
The shortcomings that possible embodiment four, is:
Whether the processing of transmitting terminal is relatively complicated, not only to identify the position that should stop decoding, also to calculate current transmission time and will cause and solve an OFDM symbol the receiving end more.
In the following, providing several preferably embodiments, respectively preferably embodiment is better than aforementioned several possible embodiments in terms of one or more following:
1. saving the bit of the instruction in HE-SIG, and receiving end can also be allowed to know the position that should stop decoding in the OFDM symbol that the last one carries useful data.
2. the case where user's OFDM symbol each for multi-user transmission is misaligned, can also let the user know that respective decoding end position.
3. do not indicating user payload length, and the length of signal extension is transmission bandwidth, MCS, when the function of fluxion and receiving end processing capacity, allows receiving end that can be properly positioned the position for the OFDM symbol that the last one carries useful data.
More excellent embodiment
It may include the filling bit of physical layer in the last one OFDM symbol of PPDU, English is PHY Padding.After the last one OFDM symbol, including one section of frame extension (signal extension, or be signal extension, abbreviation FE or SE), the processing of some additional times for receiving data is provided for receiving end.
In transmitting terminal:
Step 101: generating PPDU, the PPDU includes signal extension SE field, for the SE field after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated.
Step 102: sending the PPDU.
Optionally, whether current PPDU includes that SE can be determined by the BW in current HE-SIG, MCS, fluxion or coding mode instruction etc..
Specifically, instruction I can occupy 1 bit, it is referred to as fuzziness instruction I.How the problem of fuzziness instruction I is the concern of following each specific embodiment is efficiently set.
Generally speaking, the case where transmitting terminal is according to the PPDU OFDM symbol number N for really including and receiving end OFDM symbol number M obtained, obtains fuzziness and indicates I.
In one possible embodiment, determines that the value of fuzziness instruction I is worked as using following formula and meet TSE+ L-LENGTH Rounding Error > (12.8+TGI)us
It is that fuzziness indicates that I is the 1st value when (formula 1), it is the 2nd value that when being unsatisfactory for above-mentioned formula 1, fuzziness instruction I, which is the 1st value,.Wherein L-Length rounding error is the difference of the transmission duration of actual transmissions duration and L-length instruction.
In short, when the length of SE adds a difference, this difference is the result (L-Length rounding error) that the transmission duration calculated according to L-Length subtracts actual transmissions duration in transmitting terminal.When as soon as the result of this adduction is greater than a 4x OFDM symbol, then setting fuzziness indicates that I is 1.
Specifically, with reference to Fig. 6, considering that the PPDU comprising SE is whole in general embodiment, the difference of the transmission duration of actual duration and the L-length instruction of PPDU whole is the L-Length rounding error.
During realization, when the length of SE is the multiple of 1x OFDM length (4 microsecond), with reference to Fig. 7, the duration T for not including SE in PPDU can be only consideredSEPart, the actual duration of the part with not comprising SE L-length indicate transmission duration difference, be denoted as L-Length rounding error1；In this case, L-Length rounding error1 and L-Length rounding error is substantially identical, but its calculating process can be more simple. With reference to following examples one, example defines L-LENGTH round error (Δ by the way of formulaRE)
Example one
For not considering TSEWhen, the calculating of L-LENGTH round error1 can be by following scheme:
In transmitting terminal:
001 transmitting terminal knows actual transmission time.
For example, actual transmission time TXTIME is obtained according to formula 2,
TXTIME=TL_PREAMBLE+THE_PREAMBLE+THE_DATAFormula 2
Wherein
THE_DATA=N (12.8+TGI), N is the 4x OFDM symbol number of transmitting terminal actual needs transmission；
TL_PREAMBLERefer to the transmission duration of L-preamble.
THE_PREAMBLERefer to the transmission duration of HE-preamble.
002 obtains the value of L-LENGTH by TXTIME.
Formula 3
Wherein m is the remainder of L-LENGTH mould 3.Wherein, the value of the L-LENGTH is included in the Preamble of PPDU.
003 obtains the transmission time TXTIME* of corresponding 1x symbol by L-LENGTH:
Formula 4
004 obtains L-LENGTH round error1
Formula 5
It can replace, above-mentioned steps 001,002 or 003 are optional step, that is to say, that the formula 5 only crossed in step 004 can be led to and obtain L-LENGTH round error1.Can of course in the absence of conflict, including step 201,202 or 203 any combination.
Embodiment two
For considering TSEWhen, the calculating of L-LENGTH round error can be by following scheme:
201 transmitting terminals know true transmission time TXTIME
TXTIME=TL_PREAMBLE+THE_PREAMBLE+THE_DATA+TSEFormula 6
Wherein
THE_DATA=N (12.8+TGI), N is the 4x OFDM symbol number of transmitting terminal actual needs transmission
TL_PREAMBLERefer to the transmission duration of L-preamble.
THE_PREAMBLERefer to the transmission duration of HE-preamble
202 obtain the value of L-LENGTH by TXTIME are as follows:
Formula 7
M is the remainder of L-LENGTH mould 3
203 the transmission time of corresponding 1x symbol is calculated by L-LENGTH are as follows:
Formula 8
204 obtain L-LENGTH round error (ΔRE)。
Formula 9
It can replace, above-mentioned steps 201,202 or 203 are optional step, that is to say, that L-LENGTH round error can be obtained by the formula 9 in step 204.Can of course in the absence of conflict, including step 201,202 or 203 any combination.
Preferably, to reduce the complexity calculated, L-LENGTH round error can not be calculated using formula merely, but L-LENGTH round error (Δ is obtained according to the table of storageRE)。
Example three
For T4xOFDM=12.8+0.8 (wherein 0.8 be cyclic prefix CP length) the case where, i.e. the case where length of 4xOFDM symbol is 12.8+0.8, store following table 1,
  5n+0 5n+1 5n+2 5n+3 5n+4
Δp_RE=0 μ s ΔrE=0 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s
Δp_RE=0.8 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s ΔrE=0 μ s ΔrE=2.4 μ s
Δp_RE=1.6 μ s ΔrE=1.6 μ s ΔrE=0 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s
Δp_RE=2.4 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s ΔrE=0 μ s
Δp_RE=3.2 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s ΔrE=0 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s
Wherein the row parameter in table 1 is Δp_REFor include in PPDU Preamble and 1xOFDM symbol in the part that cannot be aligned, column parameter is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
Further, Δp_REIt can use but be not limited under type such as and calculate:
Formula 10
For T4xOFDM=12.8+1.6 (wherein 1.6 be cp length) the case where, i.e. the case where length of 4xOFDM symbol is 12.8+0.8, store following table 2.
  5n+0 5n+1 5n+2 5n+3 5n+4
Δp_RE=0 μ s ΔrE=0 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s
Δp_RE=0.8 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s ΔrE=0 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s
Δp_RE=1.6 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s ΔrE=0 μ s
Δp_RE=2.4 μ s ΔrE=2.4 μ s ΔrE=0 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s
Δp_RE=3.2 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s ΔrE=0 μ s ΔrE=1.6 μ s
           
Wherein the row parameter in table 2 is Δp_REFor include in PPDU Preamble and 1xOFDM symbol in the part that cannot be aligned, column parameter is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
Further, Δp_REIt can use but be not limited to formula 10 above-mentioned.
For T4xOFDM=12.8+3.2 (wherein 3.2 be cp length) the case where, can store table 3
  5n+0 5n+1 5n+2 5n+3 5n+4
Δp_RE=0 μ s ΔrE=0 μ s ΔrE=0 μ s ΔrE=0 μ s ΔrE=0 μ s ΔrE=0 μ s
Δp_RE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s
Δp_RE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s
Δp_RE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s
Δp_RE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s
Wherein the row parameter in table 2 is Δp_REFor include in PPDU Preamble and 1xOFDM symbol in the part that cannot be aligned, column parameter is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
Further, Δp_REIt can use but be not limited to formula 10 above-mentioned.
Example four
For T4xOFDM=12.8+0.8 (wherein 0.8 be cp length) the case where, store following table 4
  5n+0 5n+1 5n+2 5n+3 5n+4
Δp_RE=0 μ s ΔrE=0 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s
Δp_RE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s ΔrE=0 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s
Δp_RE=1.6 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s ΔrE=0 μ s
Δp_RE=2.4 μ s ΔrE=1.6 μ s ΔrE=0 μ s ΔrE=2.4 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s
Δp_RE=3.2 μ s ΔrE=0.8 μ s ΔrE=3.2 μ s ΔrE=1.6 μ s ΔrE=0 μ s ΔrE=2.4 μ s
Row parameter in table 4 is Δp_REFor include in PPDU Preamble and 1xOFDM symbol in the part that cannot be aligned, column parameter is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
Further, wherein Δp_REIt is different from previous embodiment, it uses but is not limited under type calculating such as:
Formula 11
For T4xOFDM=12.8+1.6 (wherein 1.6 be cp length) the case where, store following table 5
  5n+0 5n+1 5n+2 5n+3 5n+4
Δp_RE=0 μ s ΔrE=0 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s
Δp_RE=0.8 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s ΔrE=0 μ s ΔrE=1.6 μ s
Δp_RE=1.6 μ s ΔrE=2.4 μ s ΔrE=0 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s
Δp_RE=2.4 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s ΔrE=0 μ s
Δp_RE=3.2 μ s ΔrE=0.8 μ s ΔrE=2.4 μ s ΔrE=0 μ s ΔrE=1.6 μ s ΔrE=3.2 μ s
           
Row parameter in table 5 is Δp_REFor include in PPDU Preamble and 1xOFDM symbol in the part that cannot be aligned, column parameter is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
Further, wherein Δp_REIt is calculated using aforementioned formula 11.
For T4xOFDM=12.8+3.2 (wherein 3.2 be cp length) the case where, store following table 6
  5n+0 5n+1 5n+2 5n+3 5n+4
Δp_RE=0 μ s ΔrE=0 μ s ΔrE=0 μ s ΔrE=0 μ s ΔrE=0 μ s ΔrE=0 μ s
Δp_RE=0.8 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s ΔrE=3.2 μ s
Δp_RE=1.6 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s ΔrE=2.4 μ s
Δp_RE=2.4 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s ΔrE=1.6 μ s
Δp_RE=3.2 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s ΔrE=0.8 μ s
Row parameter in table 6 is Δp_REFor include in PPDU Preamble and 1xOFDM symbol in the part that cannot be aligned, column parameter is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
Further, wherein Δp_REIt is calculated using aforementioned formula 11.
Embodiment five
Preferably, Round Error is obtained according to table 7, wherein HE-SIGB CP is that the length of the CP for the HE-SIGB for including (may include common portion and private part in HE-SIGB in PPDU；If common portion is identical as the CP of the private part be the identical CP, if it is not the same, if be private part CP), HE-LTF is the length for the part HE-LTF for including in PPDU；4x OFDM CP is the length of the CP of the 4x OFDM symbol for the data portion for including in PPDU；NSIGBIt is the number of symbol different from HE-SIGA length in the HE-SIGB for including in PPDU；NLTFIt is the number for the LTF for including in PPDU；NDATAIt is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
It optionally may include HE Round Error, preferably, do not need comprising HE Round Error.
Table 7
Those skilled in the art it is recognised that above table can carry out various modifications and replacement, can for specific scene only in above table partial parameters obtain.The parameter of blank is the parameter without considering in upper table.
Preferably, to reduce the complexity calculated, L-LENGTH round error can not be calculated using formula merely, but is obtained according to the table of storage and calculates L-LENGTH round error (ΔRE) used by simplified formula.
Embodiment six
The case where for 4x HE-LTF (duration is 12.8 microsecond+cp), Round error formula Δ can be calculated according to the corresponding formula of parameterRE。
Table 8
In above-mentioned each formula, NSIGBIt is the number of symbol different from HE-SIGA length in the HE-SIGB for including, N in PPDULTFIt is the number for the LTF for including in PPDU；NDATAIt is the quantity for the 4xOFDM symbol for including in PPDU, such as 5n+0,5n+1 ..5n+4, n are nonnegative integer.
The case where for 2x HE-LTF (6.4 microsecond+cp), Round error formula Δ can be calculated according to the corresponding formula of parameterRE。
Table 9
Wherein NSIGBIt is the symbol numbers for having the HE-SIGB of distinct symbols length with HE-SIGA, NLTFIt is the number of HE-LTF, NDATAIt is the number of 4x OFDM symbol.
In receiving end, including
300: receiving PPDU.
301: parsing the PPDU, obtain the OFDM symbol number M1 of the PPDU transmission.
Optionally, if the value of instruction information is the first value, the value of M1 is constant；If indicating, the value of information is second value, and M1 does the operation that subtracts 1.
Correspondingly, another embodiment provides a kind of PPDU transmission processing device (not shown), it is applied to WLAN, includes processing unit 10, the PPDU includes signal extension SE field, For the SE field after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated, wherein instruction information I can be obtained according to the method for aforementioned each embodiment, details are not described herein again；Transmission unit 30, for sending the PPDU.Specific transmission method, can be with reference to method described in aforementioned each embodiment, and details are not described herein again.
Accordingly, another embodiment provides a kind of PPDU transmission processing device (not shown), applied to WLAN, it include: receiving unit 20, for receiving physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, and the SE field is after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated, wherein instruction information I can be obtained according to the method for aforementioned each embodiment, details are not described herein again；
Processing unit 40 should stop the position decoding for parsing the PPDU, and according to the instruction information acquisition, and stop decoding in the position that should stop decoding.
Above-mentioned processing unit 10 or processing unit 40 can be general processor, digital signal processor, specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate, and perhaps transistor logic, discrete hardware components may be implemented or execute disclosed each method, step and logic diagram in the embodiment of the present invention.General processor can be microprocessor or any conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and execute completion, or in processor hardware and software module combination execute completion.Readily comprehensible, the transmitting device of above-mentioned PPDU can be located at access point when being specially to send this to include the frame of resource indication field；When being specially to receive this to include the frame of resource indication field, website can be located at.
Fig. 8 is the block diagram of the access point of another embodiment of the present invention.The access point of Fig. 8 include interface 101, Processing unit 102 and memory 103.The operation of the control access point 100 of processing unit 102.Memory 103 may include read-only memory and random access memory, and provide instruction and data to processing unit 102.The a part of of memory 103 can also include non-volatile row random access memory (NVRAM).The various components of access point 100 are coupled by bus system 109, and wherein bus system 109 further includes power bus, control bus and status signal bus in addition in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 109 in figure.
The method for the aforementioned PPDU of transmission that the embodiments of the present invention disclose can be applied in processing unit 102, or be realized by processing unit 102.During realization, each step of the above method can be completed with the instruction of the integrated logic circuit of the hardware in through the processing unit 102 or software form.Processing unit 102 can be general processor, digital signal processor, specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate, and perhaps transistor logic, discrete hardware components may be implemented or execute disclosed each method, step and logic diagram in the embodiment of the present invention.General processor can be microprocessor or any conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and execute completion, or in processor hardware and software module combination execute completion.Software module can be located at random access memory, flash memory, read-only memory, in the storage medium of this fields such as programmable read only memory or electrically erasable programmable memory, register maturation.The step of storage medium is located at memory 103, and processing unit 102 reads the information in memory 103, completes the above method in conjunction with its hardware.
Fig. 9 is the block diagram of the website of another embodiment of the present invention.The access point of Fig. 9 includes interface 111, processing unit 112 and memory 113.The operation of 112 control site 110 of processing unit.Memory 113 may include read-only memory and random access memory, and provide instruction and data to processing unit 112.The a part of of memory 113 can also include non-volatile row random access memory (NVRAM).The various components of website 110 are coupled by bus system 119, and wherein bus system 119 further includes power bus, control bus and status signal bus in addition in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 119 in figure.
The method for the aforementioned PPDU of reception that the embodiments of the present invention disclose can be applied to processing unit In 112, or realized by processing unit 112.During realization, each step of the above method can be completed with the instruction of the integrated logic circuit of the hardware in through the processing unit 112 or software form.Processing unit 112 can be general processor, digital signal processor, specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate, and perhaps transistor logic, discrete hardware components may be implemented or execute disclosed each method, step and logic diagram in the embodiment of the present invention.General processor can be microprocessor or any conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and execute completion, or in processor hardware and software module combination execute completion.Software module can be located at random access memory, flash memory, read-only memory, in the storage medium of this fields such as programmable read only memory or electrically erasable programmable memory, register maturation.The step of storage medium is located at memory 113, and processing unit 112 reads the information in memory 113, completes the above method in conjunction with its hardware.
Specifically, the storage of memory 113 is so that the instruction that processing unit 112 performs the following operations: determining resource state information, the busy-idle condition of the child resource for the channel resource that resource state information instruction access point and website carry out data transmission；Resource state information is sent to access point, in order to which the access point carries out resource allocation according to resource state information.
It should be understood that " one embodiment " or " embodiment " that specification is mentioned in the whole text means that a particular feature, structure, or characteristic related with embodiment is included at least one embodiment of the present invention.Therefore, not necessarily refer to identical embodiment in " in one embodiment " or " in one embodiment " that the whole instruction occurs everywhere.In addition, these specific features, structure or characteristic can combine in any suitable manner in one or more embodiments.In various embodiments of the present invention, magnitude of the sequence numbers of the above procedures are not meant that the order of the execution order, and the execution sequence of each process should be determined by its function and internal logic, and the implementation process of the embodiments of the invention shall not be constituted with any limitation.
In addition, the terms " system " and " network " are often used interchangeably herein.The terms "and/or", only a kind of incidence relation for describing affiliated partner, indicates may exist three kinds of relationships, for example, A and/or B, can indicate: individualism A exists simultaneously A and B, these three situations of individualism B.In addition, character "/" herein, typicallying represent forward-backward correlation object is A kind of relationship of "or".
It should be understood that in embodiments of the present invention, " B corresponding with A " indicates that B is associated with A, B can be determined according to A.It is also to be understood that determining that B is not meant to determine B only according to A according to A, B can also be determined according to A and/or other information.
Those of ordinary skill in the art may be aware that, unit and algorithm steps described in conjunction with the examples disclosed in the embodiments of the present disclosure, it can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the interchangeability of hardware and software, each exemplary composition and step are generally described according to function in the above description.These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Professional technician can use different methods to achieve the described function each specific application, but such implementation should not be considered as beyond the scope of the present invention.
It is apparent to those skilled in the art that for convenience of description and succinctly, system, the specific work process of device and unit of foregoing description can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods may be implemented in other ways.Such as, the apparatus embodiments described above are merely exemplary, such as, the division of the unit, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.In addition, shown or discussed mutual coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit, be also possible to electricity, the connection of mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, and component shown as a unit may or may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can select some or all of unit therein according to the actual needs to realize the purpose of the embodiment of the present invention.
In addition, each functional unit in each embodiment of the present invention can integrate in a processing unit In, it is also possible to each unit and physically exists alone, is also possible to two or more units and is integrated in one unit.Above-mentioned integrated unit both can take the form of hardware realization, can also realize in the form of software functional units.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can be realized with hardware realization or firmware realization or their combination mode.When implemented in software, above-mentioned function can be stored in computer-readable medium or as on computer-readable medium one or more instructions or code transmit.Computer-readable medium includes computer storage media and communication media, and wherein communication media includes convenient for from a place to any medium of another place transmission computer program.Storage medium can be any usable medium that computer can access.As example but be not limited to: computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can be used in carry or store have instruction or data structure form desired program code and can be by any other medium of computer access.Furthermore.Any connection appropriate can become computer-readable medium.Such as, if software is to be transmitted using the wireless technology of coaxial cable, optical fiber cable, twisted pair, number STA line (DSL) either such as infrared ray, radio and microwave etc from website, server or other remote sources, the wireless technology of coaxial cable, optical fiber cable, twisted pair, DSL or such as infrared ray, wireless and microwave etc includes in the fixing of affiliated medium.As used in the present invention, disk (Disk) and dish (disc) include compression optical disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the usually magnetic replicate data of which disk, and dish is then with laser come optical replicate data.Combination above should also be as including within the protection scope of computer-readable medium.
In short, being not intended to limit the scope of the present invention the foregoing is merely the preferred embodiment of technical solution of the present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.

Claims (20)

  1. A kind of transmission method of physical layer protocol data unit, which is characterized in that
    Generate physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, for the SE field after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated；
    Send the PPDU.
  2. The method according to claim 1, which is characterized in that
    Work as satisfaction
    TSE+ L-LENGTH Rounding Error > (12.8+TGI)us
    The instruction information I is the 1st value when (formula 1), and it is the 2nd value that when being unsatisfactory for above-mentioned formula 1, the instruction information I, which is the 1st value,.
  3. According to the method described in claim 2, it is characterized in that,
    The L-LENGTH round error is obtained according to one of formula 2 to formula 9 or combination.
  4. According to the method described in claim 2, it is characterized in that,
    The L-LENGTH round error is obtained according to table 1 to table 9.
  5. A kind of transmission method of physical layer protocol data unit, which is characterized in that
    Receive physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, for the SE field after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated；
    The PPDU is parsed, the OFDM symbol number M1 of the PPDU transmission is obtained.
  6. Method according to claim 5, which is characterized in that
    Work as satisfaction
    TSE+ L-LENGTH Rounding Error > (12.8+TGI)us
    The instruction information I is the 1st value when (formula 1), and it is the 2nd value that when being unsatisfactory for above-mentioned formula 1, the instruction information I, which is the 1st value,.
  7. Method according to claim 5, which is characterized in that
    If the value for indicating information is the first value, the value of M1 is constant；If indicating, the value of information is second value, and M1 does the operation that subtracts 1.
  8. According to the method described in claim 6, it is characterized in that,
    The L-LENGTH round error is obtained according to one of formula 2 to formula 9 or combination.
  9. According to the method described in claim 6, it is characterized in that,
    The L-LENGTH round error is obtained according to table 1 to table 9.
  10. A kind of transmitting device of physical layer protocol data unit, which is characterized in that
    Processing unit, for generating physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, the SE field is after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated；
    Transmission unit, for sending the PPDU.
  11. Device according to claim 10, which is characterized in that
    Work as satisfaction
    TSE+ L-LENGTH Rounding Error > (12.8+TGI)us
    The instruction information I is the 1st value when (formula 1), and it is the 2nd value that when being unsatisfactory for above-mentioned formula 1, the instruction information I, which is the 1st value,.
  12. Device according to claim 11, which is characterized in that
    The L-LENGTH round error is obtained according to one of formula 2 to formula 9 or combination.
  13. Device according to claim 11, which is characterized in that
    The L-LENGTH round error is obtained according to table 1 to table 9.
  14. A kind of transmitting device of physical layer protocol data unit, which is characterized in that
    Receiving unit, for receiving physical layer protocol data unit PPDU, the PPDU includes signal extension SE field, the SE field is after carrying the last one orthogonal frequency division multiplex OFDM symbol with information, the PPDU includes instruction information, and the instruction information is located at efficient signaling field HE-SIG；Wherein, the instruction information I is generated based on the symbol lengths of SE field, is used to indicate whether receiving end should adjust the number for the OFDM symbol being calculated；
    Processing unit obtains the OFDM symbol number M1 of the PPDU transmission for parsing the PPDU.
  15. Method according to claim 14, which is characterized in that
    Work as satisfaction
    TSE+ L-LENGTH Rounding Error > (12.8+TGI)us
    The instruction information I is the 1st value when (formula 1), and it is the 2nd value that when being unsatisfactory for above-mentioned formula 1, the instruction information I, which is the 1st value,.
  16. Method according to claim 15, which is characterized in that
    If the value for indicating information is the first value, the value of M1 is constant；If indicating, the value of information is second value, and M1 does the operation that subtracts 1.
  17. According to the method for claim 16, which is characterized in that
    The L-LENGTH round error is obtained according to one of formula 2 to formula 9 or combination.
  18. According to the method for claim 16, which is characterized in that
    The L-LENGTH round error is obtained according to table 1 to table 9.
  19. Access point in a kind of WLAN, including the device and interface as described in claim 10-13 is any.
  20. Website in a kind of WLAN, including the device and interface as described in claim 14-18 is any.
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